• Title/Summary/Keyword: winding

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Analysis on Current Limiting and Voltage Sag Compensating Characteristics of a SFCL using Magnetic Coupling of Parallel Connected Two Coils (병렬연결된 두 코일의 자기결합을 이용한 초전도 전류제한기의 전류제한 및 전압강하 보상 특성 분석)

  • Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.2
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    • pp.159-163
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    • 2010
  • The superconducting fault current limiter (SFCL) plays a role in compensating the voltage sag of the sound feeder adjacent to the fault feeder as well as the fault current limiting operation of the fault feeder. Especially, the SFCL using magnetic coupling of two coils with parallel connection has different voltage sag compensating and current limiting characteristics due to the winding direction and the inductance ratio of two coils. In this paper, the current limiting and the voltage sag compensating characteristics of a SFCL using magnetic coupling of parallel connected two coils were analyzed. Through the analysis on the experimental results considering the winding direction of two coils, the SFCL designed with the additive polarity winding was shown to have the higher limited fault current than the SFCL designed with the subtractive polarity winding. In addition, it could be confirmed that the higher fault current limitation of the SFCL could be contributed to the higher load voltage sag compensation.

A Study on the Insulation Properties for Stator Form-wound Winding by Thermal Degradation Test (가속 열열화 시험에 의한 고정자 형권 코일의 절연특성에 관한 연구)

  • 채승훈;김상걸;오현석;신철기;왕종배;김기준;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.115-118
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    • 2000
  • In case of developing new motor, many examinations was tested to decide a motor efficiency and reliability. To give reliability judgment, traction motor winding insulation was tested by electrical method after appling electrical, heat, mechanical, environmental stress. In this study, stator form-wound winding of traction motor in urban transit E.M.U was tested by accelerative thermal degradation test. Stator form-wound winding was tested on the accelerative degradation composed of heat, vibration, moisture, overvoltage and researched insulation resistance, dielectric loss, partial discharge for insulation degradation properties, evaluated withstand voltage. Degradation temperature was $230[^\circ{C}]$, $250[^\circ{C}]$, $270[^\circ{C}]$, for stator form-wound winding respectively. On the test results of accelerative thermal degradation, insulation properties were relied all temperature until 10 times and expected life was evaluated by the rule of reducing $10[^\circ{C}]$ life into halves. Expected life was 31.8 years. It is guaranteed insulation reliability because of exceeding 25 years life times as considering.

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Magnetic Field Calculation of Toroidal Winding with Circular Section (단면이 원형인 토로이드 권선의 자속밀도 계산)

  • Lee, Sang-Jin
    • Progress in Superconductivity and Cryogenics
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    • v.12 no.1
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    • pp.28-31
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    • 2010
  • A magnetic field calculation method for toroidal type winding which has circular section was developed. At first, the equation for magnetic field by single filament coil was extended using numerical integration to estimate the entire interesting region of solenoid, especially winding region itself. And then, the magnetic field by toroidal arrangement of solenoids was computed with a coordinate transformation of vector fields. The superconducting magnet with toroidal arrangement can be made up of several tens of solenoid type double pancake windings for some applications such as superconducting magnetic energy storage system(SMES). In this system, the field calculation on the high-Tc superconducting(HTS) tape itself is very important because the entire system can be reached to a fault by magnetic stress of conductor or the critical current of superconducting tape can be dramatically reduced under its self field condition. To make matters worse, 3-dimensional analysis is indispensable for this type of magnet and the most of commercial programs with finite element method can be taken too much time for analysis and design. In this paper, a magnetic field calculation method for toroidal type winding with circular section was induced.

A Study on FEM Equivalent Winding Method for Reducing Analysis Time (해석 시간 저감을 위한 전기 권선의 FEM 등가 권선법)

  • Eui-Jong Park;Yong-Jae Kim
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.5
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    • pp.835-840
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    • 2023
  • Compared to 3D FEM, 2D FEM can be analyzed by simplifying the model and conditions. However, with respect to coil conditions, in many cases, direction of coils(upward, downward, entrance, exit, etc.) are sequentially configured and set up the FEM analysis conditions. This paper shows simplification of coil conditions and reduction of analysis time by applying the equivalent winding method composed of one FEM coil even if it has multiple slots, and shows consistency of results by applying it to a winding type magnetic gear.

Experimental study on bobbin contact for HTS motor field winding (고온초전도 계자권선의 보빈 접촉법에 대한 실험적 연구)

  • 김석환;손명환;백승규;조영식;서무교;이언용;권영길
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2002.02a
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    • pp.297-299
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    • 2002
  • To wind a HTS (High Temperature Superconductor) tape conductor on a bobbin, double pancake winding technique is widely used to reduce number of splicing contacts between conductor pieces. However, this makes some Ic (critical current) degradation on kink points which is unavoidable. This paper describes the two ways of winding; usual double pancake and soldered double pancake. Characteristics of the two windings are measured and compared.

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Development of High-Tech Polyester Filament Flat Yarn (고차가공 Polyester Filament Flat Yarn개발)

  • 이선화;전병대;김진학;김영규
    • Proceedings of the Korean Fiber Society Conference
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    • 2002.04a
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    • pp.371-371
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    • 2002
  • Polyester Filament Flat Yam의 경우 현재 Dope Dyed Yarn을 주로 사용하고 있지만 색상발현의 한계성으로 오랫동안 일반염색을 위해 연구하였지만 해결하지 못하고 있는 실정이다. Polyester Filament Flat Yarn의 선염이 어려운 이유는 Winding에서 치밀한 사층구조로 염료가 침투할 수 없이 치밀하게 되어 있기 때문이다. 특히 사의 이러한 치밀한 사층구조 때문에 염액침투가 어렵고, Soft Winding을 하면 미끄러짐 현상으로 사층의 붕괴가 일어나기 쉽고, Pirn Winding의 경우는 사층의 안전한 유지는 가능하지만 사층의 밀도가 높아서 염액의 순환이 순조롭지 못한 단점이 있다. (중략)

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Performance of Sealing Integrity and Banding strain of HV Polymeric bushing with Thermal Mechanical Test (열-기계적 시험에 따른 초고압 폴리머 부싱의 굽힘변형 및 기밀성능에 관한 연구)

  • Cho, Han-Goo;Yoo, Dae-Hoon;Kang, Hyung-Kyung;Lee, Chul-Ho
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1441_1441
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    • 2009
  • This paper describes performance of sealing integrity and bending strain of HV polymeric bushing with thermal mechanical test. Generally the properties of FRP tube can be influenced by the winding angle, wall thickness and winding tension. As a results, multi winding bushing shows that it has max deflection in the range of 16.5~16.9 mm.

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Hunting Protection of Synchronous Motor by Field Control (계자제어에 의한 동기전동기의 난조방지)

  • Song Yop Hahn
    • 전기의세계
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    • v.20 no.2
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    • pp.19-26
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    • 1971
  • To proteting hunting of synchronus motor a new one which has two field windings is designed. One is main field winding excited constantly and the other is control field winding excited only during the load of motor changes. The oscillation of the motor is controlled by increasing or decreasing the control field excitation. To determine the optimal field excitation the Pontryagin's minimum principle is applied. Also this paper gives the optimal trajectories of the motor and it's transition time. This motor has some of better properties than the old motor with damper winding. These phroperties are (1) there is no hunting (2) the transient stability is improved (3) transition time is very short.

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Winding Connection Changing Converter for Traction SRM (견인용 SRM의 운전특성개선을 위한 권선전환컨버터)

  • Kim, Tae-Hyoung;Lee, Dong-Hee;An, Young-Joo;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.659-660
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    • 2008
  • This paper presents a hybrid winding connection method for torque characteristics improving of a traction SRM. In order to get a high torque in wide speed range and torque ripple reduction, series and parallel winding connection are changed according to operating speed. From the analysis of torque character operation mode and efficiency, the proposed control scheme is verified.

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